Photovoltaic power generation grid-connected double-loop power supply system and method

The invention relates to the technical field of photovoltaic grid-connected power supply, and discloses a photovoltaic power generation grid-connected double-loop power supply system and method. The adopted grid-connected double-loop power supply system comprises a photovoltaic array PV power supply, a photovoltaic grid-connected inverter, a three-way reactor and a power transformer. The photovoltaic array PV power supply is connected with the input end of the photovoltaic grid-connected inverter through a direct-current boosting device, and the output end of the photovoltaic grid-connected inverter is connected with the first end of the three-way reactor; the second end of the three-way reactor is connected with the low-voltage end of the power transformer, and the high-voltage end of the power transformer is connected with a power public network through an automatic knife switch; and the third end of the three-way reactor is a power utilization end and is connected with an alternating-current load through a